NiCo2O4-Nanoparticle-Catalyzed Microwave-Assisted Dehydrogenative Direct Oxidation of Primary Alcohols to Carboxylic Acids under Oxidant-Free Conditions

IF 1.7 4区 化学 Q3 CHEMISTRY, ORGANIC Synlett Pub Date : 2024-09-09 DOI:10.1055/a-2384-6371
Kumari Anchal, Ashok R. Patel, Subhash Banerjee
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Abstract

Here, we report the NiCo2O4-nanoparticle-catalyzed dehydrogenative direct oxidation of primary alcohols to carboxylic acid in the presence of KOH under microwave irradiation in the absence of any oxidant in good to excellent yields (75–99%) within a short reaction time (5–10 min). The polycrystalline cubic spinel phase of NiCo2O4 nanoparticles (NPs) with an average size of 25 nm were synthesized by the co-precipitation method and analyzed properly by using powder X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy measurements. The NiCo2O4 NPs were stable under the reaction conditions and reused for up to eight cycles without appreciable loss in the yield of benzoic acid. According to mechanistic insight, the KOH acts as a second oxygen source and is essential for the synthesis of carboxylic acid from alcohols. The hydrogen gas was found to be the only byproduct of this method detected by chemical reactions.

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无氧化剂条件下镍钴氧化物-纳米粒子催化的微波辅助伯醇直接氧化成羧酸的脱氢反应
在此,我们报告了在微波辐照下,在没有任何氧化剂的情况下,NiCo2O4 纳米粒子催化伯醇直接氧化成羧酸的脱氢反应,在很短的反应时间(5-10 分钟)内就获得了良好到极佳的产率(75-99%)。共沉淀法合成了平均粒径为 25 nm 的多晶立方尖晶石相 NiCo2O4 纳米粒子(NPs),并通过粉末 X 射线衍射、场发射扫描电子显微镜、能量色散 X 射线光谱和透射电子显微镜测量进行了正确分析。NiCo2O4 NPs 在反应条件下非常稳定,可重复使用八次,苯甲酸的产率没有明显下降。根据机理分析,KOH 可作为第二氧气源,是醇类合成羧酸的关键。氢气是该方法通过化学反应检测到的唯一副产品。
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来源期刊
Synlett
Synlett 化学-有机化学
CiteScore
3.40
自引率
5.00%
发文量
369
审稿时长
1 months
期刊介绍: SYNLETT is an international journal reporting research results and current trends in chemical synthesis in short personalized reviews and preliminary communications. It covers all fields of scientific endeavor that involve organic synthesis, including catalysis, organometallic, medicinal, biological, and photochemistry, but also related disciplines and offers the possibility to publish scientific primary data.
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